THC Driving Bill Passes Colorado Senate, Awaits Governor’s Signature
Colorado drivers now need to learn new limits for Driving Under the Influence of Drugs (DUID). House Bill 1325, which sets limits on blood levels for driving after smoking marijuana, has been passed by the Colorado Senate and now awaits Governor John Hickenlooper’s signature. If signed by the governor, drivers whose blood exceeds five nanograms per millileter (ng/mL) of THC per milliliter will be presumed to be driving while stoned.
The bill allows drivers who have been charged with DUID to argue whether they were impaired at the five ng/mL level. This is unlike impairment of alcohol charges because the driver cannot argue whether the 0.08 blood alcohol level (B.A.C.) truly impairs the driver.
The legislature drafted the bill to allow the driver to refute the five ng/mL level because THC can linger in users for longer periods of time. Typically the ng/mL level of THC is extremely high upon initial use and drops off after two to six hours. Some studies have indicated that habitual users would not be affected by this law because habitual users can sustain a level of THC below five ng/mL days after use.
On the other hand, other studies have shown that users may still have ng/mL levels more than five days after use. Dr. Lantz, the head toxicologist from Rocky Mountain Labs, claims to have test results from an individual showing a 20 ng/mL level at 24 hours after last use. At this level, the legislature feels someone is too high to drive, but the legislature has recognized that it’s next to impossible to determine actual impairment via a blood test under currently available testing technology. Therefore, the legislature has written the bill in a manner that allows users to argue whether their ng/mL level amounted to actual impairment.
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The General Assembly is currently debating whether they should sign in House Bill 1077. House Bill 1077 would be instrumental in changing current laws regarding DUI, DUI per se, and DWAI arrests. The bill would allow drivers to challenge the validity of the law enforcement officer’s initial contact with the driver at Department of Revenue (DOR) driver’s license revocation hearings. The hearing officer will consider these issues when a driver raises them as defenses.
In Colorado and other states, police units have begun relying on laser technology to monitor the speed of drivers and to ticket those who are exceeding the speed limit. While many law enforcement agencies hail the developing technology as a benefit, many drivers aren’t so sure that the benefits outweigh the costs.
The case before the Court involved a driver from Missouri, who was pulled over on suspicion of drunk driving. After administering several field sobriety tests, the police officer asked the driver to submit to a breath test. He refused and was taken to a hospital, where blood was drawn despite the driver’s objections. The driver was later convicted of a DUI in Missouri. The Missouri Supreme Court, however, threw out the blood test results, stating that the officer’s failure to get a warrant made the blood draw an “unreasonable” search and seizure prohibited by the Fourth Amendment.
Like several other states, Colorado has a law that requires drivers to submit to chemical testing for alcohol if a police officer requests one on the basis of probable cause to believe the driver is driving under the influence of alcohol (DUI) or driving while ability impaired (DWAI) in Colorado. Colorado refers to this rule as the “express consent” law.
Colorado recently passed three new gun-control laws that change how residents can buy and keep guns and related equipment legally. The laws have raised a number of questions among gun buyers, dealers, and others, according to a recent article in the Denver Post.


